if i check a flight and it doesn't come up as an option when i'm searching the standard award travel, does this mean that this flight is full in every booking class?

i'm booked on the den-iad flight UA 540 on sunday august the 27th and i was checking to see the availability and it's not coming up at all, does this mean zeroed out in every class?

does KVS or ExperFlyer give better information than just doing the expert mode multicity search or standard award search to check availability in each booking class?

would anyone check this flight for me if they have access?

i would subscribe if i find that they're useful